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From: "ed at catmur dot uk" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/109070] New: ICE in class template member function
 overloads distinguished by non-functionally-equivalent constraints and return
 type
Date: Wed, 08 Mar 2023 21:01:12 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 13.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: ed at catmur dot uk
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109070

            Bug ID: 109070
           Summary: ICE in class template member function overloads
                    distinguished by non-functionally-equivalent
                    constraints and return type
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ed at catmur dot uk
  Target Milestone: ---

template<int I> concept C =3D true;
template<typename T> struct A {
    int f() requires C<42> { return 1; }  // #1
    unsigned f() requires true { return 2u; }  // #2
};
int main() {
    int (A<int>::*p)() =3D &A<int>::f;
    unsigned (A<int>::*q)() =3D &A<int>::f;
    return (A<int>().*p)() + (A<int>().*q)();
}

<source>:10:1: error: Two symbols with same comdat_group are not linked by =
the
same_comdat_group list.
   10 | }
      | ^
_ZN1AIiE1fEv/2 (unsigned int A<T>::f() requires  true [with T =3D int])
  Type: function definition analyzed
  Visibility: semantic_interposition public weak comdat
comdat_group:_ZN1AIiE1fEv one_only
  previous sharing asm name: 1
  Address is taken.
  References:=20
  Referring: main/0 (addr)=20
  Function flags: body
  Called by:=20
  Calls:=20
_ZN1AIiE1fEv/1 (int A<T>::f() requires  C<42> [with T =3D int])
  Type: function definition analyzed
  Visibility: semantic_interposition public weak comdat
comdat_group:_ZN1AIiE1fEv one_only
  next sharing asm name: 2
  Address is taken.
  References:=20
  Referring: main/0 (addr)=20
  Function flags: body
  Called by:=20
  Calls:=20
<source>:10:1: internal compiler error: symtab_node::verify failed
0x247b73e internal_error(char const*, ...)
        ???:0
0xed5c22 symtab_node::verify_symtab_nodes()
        ???:0
0xef042b symbol_table::finalize_compilation_unit()
        ???:0

This is valid per [temp.over.link]/5, but that seems impossible to implemen=
t -
I've filed https://github.com/cplusplus/CWG/issues/256.=